Resumo

ESPER ANGILLIERI, María Yanina. Susceptibilidad a la ocurrencia de flujos de detritos, mediante sig, en una porción del departamento de Iglesia, San Juan. Rev. Asoc. Geol. Argent. [online]. 2014, vol.71, n.2, pp.267-274. ISSN 0004-4822.

The statistical index (Wi) and frequency ratio (Fr) models are applied for analysis of debris flows susceptibility in a portion of the Iglesia department of San Juan around 30°S latitude, by means of an investigation based on the Geographic Information System. For this purpose were used thematic layers: debris flows inventory, lithology, elevation, slope, aspect, and solar radiation. The debris flow inventory map was prepared by interpreting aerial photographs and satellite images, supported by field surveys. Lithology was extracted from an existing geological map. Slope, aspect and solar radiation were calculated from a digital elevation model. Both models helped produce debris flows susceptibility maps that classified susceptibility into five categories: very low, low, moderate, high and very high. Subsequently each debris flows susceptibility map was compared with known debris flows locations and tested. As a result, both models have similar prediction, where the 82.65% (statistical index model ) and the 82.71% (frequency ratio model) of the flows coincided with the high and very high categories.

Palavras-chave : Susceptibility; Debris flows; Thematic layers; GIS.

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